@angular/core
Version:
Angular - the core framework
308 lines • 36.8 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { Injector } from './injector';
import { THROW_IF_NOT_FOUND } from './injector_compatibility';
import { Self, SkipSelf } from './metadata';
import { cyclicDependencyError, instantiationError, noProviderError, outOfBoundsError } from './reflective_errors';
import { ReflectiveKey } from './reflective_key';
import { resolveReflectiveProviders } from './reflective_provider';
// Threshold for the dynamic version
const UNDEFINED = {};
/**
* A ReflectiveDependency injection container used for instantiating objects and resolving
* dependencies.
*
* An `Injector` is a replacement for a `new` operator, which can automatically resolve the
* constructor dependencies.
*
* In typical use, application code asks for the dependencies in the constructor and they are
* resolved by the `Injector`.
*
* @usageNotes
* ### Example
*
* The following example creates an `Injector` configured to create `Engine` and `Car`.
*
* ```typescript
* @Injectable()
* class Engine {
* }
*
* @Injectable()
* class Car {
* constructor(public engine:Engine) {}
* }
*
* var injector = ReflectiveInjector.resolveAndCreate([Car, Engine]);
* var car = injector.get(Car);
* expect(car instanceof Car).toBe(true);
* expect(car.engine instanceof Engine).toBe(true);
* ```
*
* Notice, we don't use the `new` operator because we explicitly want to have the `Injector`
* resolve all of the object's dependencies automatically.
*
* @deprecated from v5 - slow and brings in a lot of code, Use `Injector.create` instead.
* @publicApi
*/
export class ReflectiveInjector {
/**
* Turns an array of provider definitions into an array of resolved providers.
*
* A resolution is a process of flattening multiple nested arrays and converting individual
* providers into an array of `ResolvedReflectiveProvider`s.
*
* @usageNotes
* ### Example
*
* ```typescript
* @Injectable()
* class Engine {
* }
*
* @Injectable()
* class Car {
* constructor(public engine:Engine) {}
* }
*
* var providers = ReflectiveInjector.resolve([Car, [[Engine]]]);
*
* expect(providers.length).toEqual(2);
*
* expect(providers[0] instanceof ResolvedReflectiveProvider).toBe(true);
* expect(providers[0].key.displayName).toBe("Car");
* expect(providers[0].dependencies.length).toEqual(1);
* expect(providers[0].factory).toBeDefined();
*
* expect(providers[1].key.displayName).toBe("Engine");
* });
* ```
*
*/
static resolve(providers) {
return resolveReflectiveProviders(providers);
}
/**
* Resolves an array of providers and creates an injector from those providers.
*
* The passed-in providers can be an array of `Type`, `Provider`,
* or a recursive array of more providers.
*
* @usageNotes
* ### Example
*
* ```typescript
* @Injectable()
* class Engine {
* }
*
* @Injectable()
* class Car {
* constructor(public engine:Engine) {}
* }
*
* var injector = ReflectiveInjector.resolveAndCreate([Car, Engine]);
* expect(injector.get(Car) instanceof Car).toBe(true);
* ```
*/
static resolveAndCreate(providers, parent) {
const ResolvedReflectiveProviders = ReflectiveInjector.resolve(providers);
return ReflectiveInjector.fromResolvedProviders(ResolvedReflectiveProviders, parent);
}
/**
* Creates an injector from previously resolved providers.
*
* This API is the recommended way to construct injectors in performance-sensitive parts.
*
* @usageNotes
* ### Example
*
* ```typescript
* @Injectable()
* class Engine {
* }
*
* @Injectable()
* class Car {
* constructor(public engine:Engine) {}
* }
*
* var providers = ReflectiveInjector.resolve([Car, Engine]);
* var injector = ReflectiveInjector.fromResolvedProviders(providers);
* expect(injector.get(Car) instanceof Car).toBe(true);
* ```
*/
static fromResolvedProviders(providers, parent) {
return new ReflectiveInjector_(providers, parent);
}
}
export class ReflectiveInjector_ {
/**
* Private
*/
constructor(_providers, _parent) {
/** @internal */
this._constructionCounter = 0;
this._providers = _providers;
this.parent = _parent || null;
const len = _providers.length;
this.keyIds = [];
this.objs = [];
for (let i = 0; i < len; i++) {
this.keyIds[i] = _providers[i].key.id;
this.objs[i] = UNDEFINED;
}
}
get(token, notFoundValue = THROW_IF_NOT_FOUND) {
return this._getByKey(ReflectiveKey.get(token), null, notFoundValue);
}
resolveAndCreateChild(providers) {
const ResolvedReflectiveProviders = ReflectiveInjector.resolve(providers);
return this.createChildFromResolved(ResolvedReflectiveProviders);
}
createChildFromResolved(providers) {
const inj = new ReflectiveInjector_(providers);
inj.parent = this;
return inj;
}
resolveAndInstantiate(provider) {
return this.instantiateResolved(ReflectiveInjector.resolve([provider])[0]);
}
instantiateResolved(provider) {
return this._instantiateProvider(provider);
}
getProviderAtIndex(index) {
if (index < 0 || index >= this._providers.length) {
throw outOfBoundsError(index);
}
return this._providers[index];
}
/** @internal */
_new(provider) {
if (this._constructionCounter++ > this._getMaxNumberOfObjects()) {
throw cyclicDependencyError(this, provider.key);
}
return this._instantiateProvider(provider);
}
_getMaxNumberOfObjects() {
return this.objs.length;
}
_instantiateProvider(provider) {
if (provider.multiProvider) {
const res = [];
for (let i = 0; i < provider.resolvedFactories.length; ++i) {
res[i] = this._instantiate(provider, provider.resolvedFactories[i]);
}
return res;
}
else {
return this._instantiate(provider, provider.resolvedFactories[0]);
}
}
_instantiate(provider, ResolvedReflectiveFactory) {
const factory = ResolvedReflectiveFactory.factory;
let deps;
try {
deps =
ResolvedReflectiveFactory.dependencies.map(dep => this._getByReflectiveDependency(dep));
}
catch (e) {
if (e.addKey) {
e.addKey(this, provider.key);
}
throw e;
}
let obj;
try {
obj = factory(...deps);
}
catch (e) {
throw instantiationError(this, e, e.stack, provider.key);
}
return obj;
}
_getByReflectiveDependency(dep) {
return this._getByKey(dep.key, dep.visibility, dep.optional ? null : THROW_IF_NOT_FOUND);
}
_getByKey(key, visibility, notFoundValue) {
if (key === ReflectiveInjector_.INJECTOR_KEY) {
return this;
}
if (visibility instanceof Self) {
return this._getByKeySelf(key, notFoundValue);
}
else {
return this._getByKeyDefault(key, notFoundValue, visibility);
}
}
_getObjByKeyId(keyId) {
for (let i = 0; i < this.keyIds.length; i++) {
if (this.keyIds[i] === keyId) {
if (this.objs[i] === UNDEFINED) {
this.objs[i] = this._new(this._providers[i]);
}
return this.objs[i];
}
}
return UNDEFINED;
}
/** @internal */
_throwOrNull(key, notFoundValue) {
if (notFoundValue !== THROW_IF_NOT_FOUND) {
return notFoundValue;
}
else {
throw noProviderError(this, key);
}
}
/** @internal */
_getByKeySelf(key, notFoundValue) {
const obj = this._getObjByKeyId(key.id);
return (obj !== UNDEFINED) ? obj : this._throwOrNull(key, notFoundValue);
}
/** @internal */
_getByKeyDefault(key, notFoundValue, visibility) {
let inj;
if (visibility instanceof SkipSelf) {
inj = this.parent;
}
else {
inj = this;
}
while (inj instanceof ReflectiveInjector_) {
const inj_ = inj;
const obj = inj_._getObjByKeyId(key.id);
if (obj !== UNDEFINED)
return obj;
inj = inj_.parent;
}
if (inj !== null) {
return inj.get(key.token, notFoundValue);
}
else {
return this._throwOrNull(key, notFoundValue);
}
}
get displayName() {
const providers = _mapProviders(this, (b) => ' "' + b.key.displayName + '" ')
.join(', ');
return `ReflectiveInjector(providers: [${providers}])`;
}
toString() {
return this.displayName;
}
}
ReflectiveInjector_.INJECTOR_KEY = ReflectiveKey.get(Injector);
function _mapProviders(injector, fn) {
const res = [];
for (let i = 0; i < injector._providers.length; ++i) {
res[i] = fn(injector.getProviderAtIndex(i));
}
return res;
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Injector} from './injector';\nimport {THROW_IF_NOT_FOUND} from './injector_compatibility';\nimport {Provider} from './interface/provider';\nimport {Self, SkipSelf} from './metadata';\nimport {cyclicDependencyError, instantiationError, noProviderError, outOfBoundsError} from './reflective_errors';\nimport {ReflectiveKey} from './reflective_key';\nimport {ReflectiveDependency, ResolvedReflectiveFactory, ResolvedReflectiveProvider, resolveReflectiveProviders} from './reflective_provider';\n\n\n// Threshold for the dynamic version\nconst UNDEFINED = {};\n\n/**\n * A ReflectiveDependency injection container used for instantiating objects and resolving\n * dependencies.\n *\n * An `Injector` is a replacement for a `new` operator, which can automatically resolve the\n * constructor dependencies.\n *\n * In typical use, application code asks for the dependencies in the constructor and they are\n * resolved by the `Injector`.\n *\n * @usageNotes\n * ### Example\n *\n * The following example creates an `Injector` configured to create `Engine` and `Car`.\n *\n * ```typescript\n * @Injectable()\n * class Engine {\n * }\n *\n * @Injectable()\n * class Car {\n *   constructor(public engine:Engine) {}\n * }\n *\n * var injector = ReflectiveInjector.resolveAndCreate([Car, Engine]);\n * var car = injector.get(Car);\n * expect(car instanceof Car).toBe(true);\n * expect(car.engine instanceof Engine).toBe(true);\n * ```\n *\n * Notice, we don't use the `new` operator because we explicitly want to have the `Injector`\n * resolve all of the object's dependencies automatically.\n *\n * @deprecated from v5 - slow and brings in a lot of code, Use `Injector.create` instead.\n * @publicApi\n */\nexport abstract class ReflectiveInjector implements Injector {\n  /**\n   * Turns an array of provider definitions into an array of resolved providers.\n   *\n   * A resolution is a process of flattening multiple nested arrays and converting individual\n   * providers into an array of `ResolvedReflectiveProvider`s.\n   *\n   * @usageNotes\n   * ### Example\n   *\n   * ```typescript\n   * @Injectable()\n   * class Engine {\n   * }\n   *\n   * @Injectable()\n   * class Car {\n   *   constructor(public engine:Engine) {}\n   * }\n   *\n   * var providers = ReflectiveInjector.resolve([Car, [[Engine]]]);\n   *\n   * expect(providers.length).toEqual(2);\n   *\n   * expect(providers[0] instanceof ResolvedReflectiveProvider).toBe(true);\n   * expect(providers[0].key.displayName).toBe(\"Car\");\n   * expect(providers[0].dependencies.length).toEqual(1);\n   * expect(providers[0].factory).toBeDefined();\n   *\n   * expect(providers[1].key.displayName).toBe(\"Engine\");\n   * });\n   * ```\n   *\n   */\n  static resolve(providers: Provider[]): ResolvedReflectiveProvider[] {\n    return resolveReflectiveProviders(providers);\n  }\n\n  /**\n   * Resolves an array of providers and creates an injector from those providers.\n   *\n   * The passed-in providers can be an array of `Type`, `Provider`,\n   * or a recursive array of more providers.\n   *\n   * @usageNotes\n   * ### Example\n   *\n   * ```typescript\n   * @Injectable()\n   * class Engine {\n   * }\n   *\n   * @Injectable()\n   * class Car {\n   *   constructor(public engine:Engine) {}\n   * }\n   *\n   * var injector = ReflectiveInjector.resolveAndCreate([Car, Engine]);\n   * expect(injector.get(Car) instanceof Car).toBe(true);\n   * ```\n   */\n  static resolveAndCreate(providers: Provider[], parent?: Injector): ReflectiveInjector {\n    const ResolvedReflectiveProviders = ReflectiveInjector.resolve(providers);\n    return ReflectiveInjector.fromResolvedProviders(ResolvedReflectiveProviders, parent);\n  }\n\n  /**\n   * Creates an injector from previously resolved providers.\n   *\n   * This API is the recommended way to construct injectors in performance-sensitive parts.\n   *\n   * @usageNotes\n   * ### Example\n   *\n   * ```typescript\n   * @Injectable()\n   * class Engine {\n   * }\n   *\n   * @Injectable()\n   * class Car {\n   *   constructor(public engine:Engine) {}\n   * }\n   *\n   * var providers = ReflectiveInjector.resolve([Car, Engine]);\n   * var injector = ReflectiveInjector.fromResolvedProviders(providers);\n   * expect(injector.get(Car) instanceof Car).toBe(true);\n   * ```\n   */\n  static fromResolvedProviders(providers: ResolvedReflectiveProvider[], parent?: Injector):\n      ReflectiveInjector {\n    return new ReflectiveInjector_(providers, parent);\n  }\n\n\n  /**\n   * Parent of this injector.\n   *\n   * <!-- TODO: Add a link to the section of the user guide talking about hierarchical injection.\n   * -->\n   */\n  abstract get parent(): Injector|null;\n\n  /**\n   * Resolves an array of providers and creates a child injector from those providers.\n   *\n   * <!-- TODO: Add a link to the section of the user guide talking about hierarchical injection.\n   * -->\n   *\n   * The passed-in providers can be an array of `Type`, `Provider`,\n   * or a recursive array of more providers.\n   *\n   * @usageNotes\n   * ### Example\n   *\n   * ```typescript\n   * class ParentProvider {}\n   * class ChildProvider {}\n   *\n   * var parent = ReflectiveInjector.resolveAndCreate([ParentProvider]);\n   * var child = parent.resolveAndCreateChild([ChildProvider]);\n   *\n   * expect(child.get(ParentProvider) instanceof ParentProvider).toBe(true);\n   * expect(child.get(ChildProvider) instanceof ChildProvider).toBe(true);\n   * expect(child.get(ParentProvider)).toBe(parent.get(ParentProvider));\n   * ```\n   */\n  abstract resolveAndCreateChild(providers: Provider[]): ReflectiveInjector;\n\n  /**\n   * Creates a child injector from previously resolved providers.\n   *\n   * <!-- TODO: Add a link to the section of the user guide talking about hierarchical injection.\n   * -->\n   *\n   * This API is the recommended way to construct injectors in performance-sensitive parts.\n   *\n   * @usageNotes\n   * ### Example\n   *\n   * ```typescript\n   * class ParentProvider {}\n   * class ChildProvider {}\n   *\n   * var parentProviders = ReflectiveInjector.resolve([ParentProvider]);\n   * var childProviders = ReflectiveInjector.resolve([ChildProvider]);\n   *\n   * var parent = ReflectiveInjector.fromResolvedProviders(parentProviders);\n   * var child = parent.createChildFromResolved(childProviders);\n   *\n   * expect(child.get(ParentProvider) instanceof ParentProvider).toBe(true);\n   * expect(child.get(ChildProvider) instanceof ChildProvider).toBe(true);\n   * expect(child.get(ParentProvider)).toBe(parent.get(ParentProvider));\n   * ```\n   */\n  abstract createChildFromResolved(providers: ResolvedReflectiveProvider[]): ReflectiveInjector;\n\n  /**\n   * Resolves a provider and instantiates an object in the context of the injector.\n   *\n   * The created object does not get cached by the injector.\n   *\n   * @usageNotes\n   * ### Example\n   *\n   * ```typescript\n   * @Injectable()\n   * class Engine {\n   * }\n   *\n   * @Injectable()\n   * class Car {\n   *   constructor(public engine:Engine) {}\n   * }\n   *\n   * var injector = ReflectiveInjector.resolveAndCreate([Engine]);\n   *\n   * var car = injector.resolveAndInstantiate(Car);\n   * expect(car.engine).toBe(injector.get(Engine));\n   * expect(car).not.toBe(injector.resolveAndInstantiate(Car));\n   * ```\n   */\n  abstract resolveAndInstantiate(provider: Provider): any;\n\n  /**\n   * Instantiates an object using a resolved provider in the context of the injector.\n   *\n   * The created object does not get cached by the injector.\n   *\n   * @usageNotes\n   * ### Example\n   *\n   * ```typescript\n   * @Injectable()\n   * class Engine {\n   * }\n   *\n   * @Injectable()\n   * class Car {\n   *   constructor(public engine:Engine) {}\n   * }\n   *\n   * var injector = ReflectiveInjector.resolveAndCreate([Engine]);\n   * var carProvider = ReflectiveInjector.resolve([Car])[0];\n   * var car = injector.instantiateResolved(carProvider);\n   * expect(car.engine).toBe(injector.get(Engine));\n   * expect(car).not.toBe(injector.instantiateResolved(carProvider));\n   * ```\n   */\n  abstract instantiateResolved(provider: ResolvedReflectiveProvider): any;\n\n  abstract get(token: any, notFoundValue?: any): any;\n}\n\nexport class ReflectiveInjector_ implements ReflectiveInjector {\n  private static INJECTOR_KEY = ReflectiveKey.get(Injector);\n  /** @internal */\n  _constructionCounter: number = 0;\n  /** @internal */\n  public _providers: ResolvedReflectiveProvider[];\n  public readonly parent: Injector|null;\n\n  keyIds: number[];\n  objs: any[];\n  /**\n   * Private\n   */\n  constructor(_providers: ResolvedReflectiveProvider[], _parent?: Injector) {\n    this._providers = _providers;\n    this.parent = _parent || null;\n\n    const len = _providers.length;\n\n    this.keyIds = [];\n    this.objs = [];\n\n    for (let i = 0; i < len; i++) {\n      this.keyIds[i] = _providers[i].key.id;\n      this.objs[i] = UNDEFINED;\n    }\n  }\n\n  get(token: any, notFoundValue: any = THROW_IF_NOT_FOUND): any {\n    return this._getByKey(ReflectiveKey.get(token), null, notFoundValue);\n  }\n\n  resolveAndCreateChild(providers: Provider[]): ReflectiveInjector {\n    const ResolvedReflectiveProviders = ReflectiveInjector.resolve(providers);\n    return this.createChildFromResolved(ResolvedReflectiveProviders);\n  }\n\n  createChildFromResolved(providers: ResolvedReflectiveProvider[]): ReflectiveInjector {\n    const inj = new ReflectiveInjector_(providers);\n    (inj as {parent: Injector | null}).parent = this;\n    return inj;\n  }\n\n  resolveAndInstantiate(provider: Provider): any {\n    return this.instantiateResolved(ReflectiveInjector.resolve([provider])[0]);\n  }\n\n  instantiateResolved(provider: ResolvedReflectiveProvider): any {\n    return this._instantiateProvider(provider);\n  }\n\n  getProviderAtIndex(index: number): ResolvedReflectiveProvider {\n    if (index < 0 || index >= this._providers.length) {\n      throw outOfBoundsError(index);\n    }\n    return this._providers[index];\n  }\n\n  /** @internal */\n  _new(provider: ResolvedReflectiveProvider): any {\n    if (this._constructionCounter++ > this._getMaxNumberOfObjects()) {\n      throw cyclicDependencyError(this, provider.key);\n    }\n    return this._instantiateProvider(provider);\n  }\n\n  private _getMaxNumberOfObjects(): number {\n    return this.objs.length;\n  }\n\n  private _instantiateProvider(provider: ResolvedReflectiveProvider): any {\n    if (provider.multiProvider) {\n      const res = [];\n      for (let i = 0; i < provider.resolvedFactories.length; ++i) {\n        res[i] = this._instantiate(provider, provider.resolvedFactories[i]);\n      }\n      return res;\n    } else {\n      return this._instantiate(provider, provider.resolvedFactories[0]);\n    }\n  }\n\n  private _instantiate(\n      provider: ResolvedReflectiveProvider,\n      ResolvedReflectiveFactory: ResolvedReflectiveFactory): any {\n    const factory = ResolvedReflectiveFactory.factory;\n\n    let deps: any[];\n    try {\n      deps =\n          ResolvedReflectiveFactory.dependencies.map(dep => this._getByReflectiveDependency(dep));\n    } catch (e) {\n      if (e.addKey) {\n        e.addKey(this, provider.key);\n      }\n      throw e;\n    }\n\n    let obj: any;\n    try {\n      obj = factory(...deps);\n    } catch (e) {\n      throw instantiationError(this, e, e.stack, provider.key);\n    }\n\n    return obj;\n  }\n\n  private _getByReflectiveDependency(dep: ReflectiveDependency): any {\n    return this._getByKey(dep.key, dep.visibility, dep.optional ? null : THROW_IF_NOT_FOUND);\n  }\n\n  private _getByKey(key: ReflectiveKey, visibility: Self|SkipSelf|null, notFoundValue: any): any {\n    if (key === ReflectiveInjector_.INJECTOR_KEY) {\n      return this;\n    }\n\n    if (visibility instanceof Self) {\n      return this._getByKeySelf(key, notFoundValue);\n\n    } else {\n      return this._getByKeyDefault(key, notFoundValue, visibility);\n    }\n  }\n\n  private _getObjByKeyId(keyId: number): any {\n    for (let i = 0; i < this.keyIds.length; i++) {\n      if (this.keyIds[i] === keyId) {\n        if (this.objs[i] === UNDEFINED) {\n          this.objs[i] = this._new(this._providers[i]);\n        }\n\n        return this.objs[i];\n      }\n    }\n\n    return UNDEFINED;\n  }\n\n  /** @internal */\n  _throwOrNull(key: ReflectiveKey, notFoundValue: any): any {\n    if (notFoundValue !== THROW_IF_NOT_FOUND) {\n      return notFoundValue;\n    } else {\n      throw noProviderError(this, key);\n    }\n  }\n\n  /** @internal */\n  _getByKeySelf(key: ReflectiveKey, notFoundValue: any): any {\n    const obj = this._getObjByKeyId(key.id);\n    return (obj !== UNDEFINED) ? obj : this._throwOrNull(key, notFoundValue);\n  }\n\n  /** @internal */\n  _getByKeyDefault(key: ReflectiveKey, notFoundValue: any, visibility: Self|SkipSelf|null): any {\n    let inj: Injector|null;\n\n    if (visibility instanceof SkipSelf) {\n      inj = this.parent;\n    } else {\n      inj = this;\n    }\n\n    while (inj instanceof ReflectiveInjector_) {\n      const inj_ = <ReflectiveInjector_>inj;\n      const obj = inj_._getObjByKeyId(key.id);\n      if (obj !== UNDEFINED) return obj;\n      inj = inj_.parent;\n    }\n    if (inj !== null) {\n      return inj.get(key.token, notFoundValue);\n    } else {\n      return this._throwOrNull(key, notFoundValue);\n    }\n  }\n\n  get displayName(): string {\n    const providers =\n        _mapProviders(this, (b: ResolvedReflectiveProvider) => ' \"' + b.key.displayName + '\" ')\n            .join(', ');\n    return `ReflectiveInjector(providers: [${providers}])`;\n  }\n\n  toString(): string {\n    return this.displayName;\n  }\n}\n\nfunction _mapProviders(injector: ReflectiveInjector_, fn: Function): any[] {\n  const res: any[] = [];\n  for (let i = 0; i < injector._providers.length; ++i) {\n    res[i] = fn(injector.getProviderAtIndex(i));\n  }\n  return res;\n}\n"]}